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                **arguments** * * * * * 在函數調用時(不管是調用還是被調用),會自動在該函數內部生成一個名為 `arguments` 的隱藏對象,該對象是個類數組。 * * * * * **注意: `arguments` 只有在函數調用時才會生成,所以它保存的是實參,每個函數都有自己的 `arguments` ,所以下面例子的 `arguments` 不相等** * * * * * ![](https://box.kancloud.cn/6b35b79000786f5bd641ffced0b36ad0_383x265.png) * * * * * 如果一個函數返回一個函數里面包含 `arguments` ,那么這個 `arguments` 就是返回那個函數傳入的實參數。 ``` function outer() { return function () { console.log(arguments) } } ``` ![](https://box.kancloud.cn/98942fa7c525ae5bfb4f53a2496295e7_489x243.png)
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